<template>
  <div class="bottom-menu">
    <CheckButton class="select-all" @checkBtnClick=" checkBtnClick " v-model=" isSelectAll "></CheckButton>
    <span>全选</span>
    <span class="total-price">合计: ¥{{ totalPrice }}</span>
    <span class="buy-product">去计算({{ $store.getters.cartCount }})</span>
  </div>
</template>

<script>
import CheckButton from './CheckButton.vue'

export default {
  name: "BottomBar",
  components: {
    CheckButton
  },
  computed: {
    totalPrice ()
    {
      const cartList = this.$store.getters.cartList;
      return cartList.filter( item =>
      {
        return item.checked
      } ).reduce( ( preValue, item ) =>
      {
        return preValue + item.count * item.newPrice
      }, 0 ).toFixed( 2 )
    },
    isSelectAll: function ()
    {
      return this.$store.getters.cartList.find( item => item.checked === false ) === undefined;
    }
  },
  methods: {
    checkBtnClick: function ()
    {
      // 1.判断是否有未选中的按钮
      let isSelectAll = this.$store.getters.cartList.find( item => !item.checked );

      // 2.有未选中的内容, 则全部选中
      if ( isSelectAll )
      {
        this.$store.state.cartList.forEach( item =>
        {
          item.checked = true;
        } );
      } else
      {
        this.$store.state.cartList.forEach( item =>
        {
          item.checked = false;
        } );
      }
    }
  }
}
</script>

<style scoped>
.bottom-menu {
  width: 100%;
  height: 44px;
  background-color: #eee;
  position: fixed;
  bottom: 50px;
  left: 0;
  box-shadow: 0 -2px 3px rgba(0, 0, 0, .2);
  font-size: 14px;
  color: #888;
  line-height: 44px;
  padding-left: 35px;
  box-sizing: border-box;
}

.bottom-menu .select-all {
  position: absolute;
  line-height: 0;
  left: 12px;
  top: 13px;
}

.bottom-menu .total-price {
  margin-left: 15px;
  font-size: 16px;
  color: #666;
}

.bottom-menu .buy-product {
  background-color: orangered;
  color: #fff;
  width: 100px;
  height: 44px;
  text-align: center;
  line-height: 44px;
  float: right;
}
</style>
